Voice even if one of you is or both are travelling a long way, it would still be awful to be stuck in a bad date. The internet hides so much.
Cameras do lie, and what you think is a funny personality quirk can turn out to be how that person is, every second of the day. Like one guy I met used to act stupid. It made me laugh. It turned out he actually was stupid and it wasn't a comedy act. Or they might be a letch, have a grating voice or laugh, or have terrible teeth/no teeth, or be eight stone more than you thought, and because they took overhead pics, you can't tell.
Or they might have a complete personality change and begin wanking into a small green plastic bag while wailing 'I'm so vulnerable' then proceed to stalk you for a year (and that was a third date, but hey, might happen on someones first... fucking hope not though)
If there was a lot of distance involved I'd maybe relent on my rule just a tiny bit and say two hours rather than one. That could be just about bearable if it was bad.
I see the first date though as just verifying you are both roughly who you say you are and whether you have teeth or not, and if you take an instant, unexplainable dislike to one another or not. It's not really a proper date when you think of it like that, it's replacing the real life meeting in person that OD takes away.